Building permits, zoning and land rules in Dane County, Wisconsin

A new one- or two-family home in Dane County needs a Uniform Dwelling Code permit, including a stick-built, modular or manufactured-home installation¹. Wisconsin's UDC supplies the construction standards and inspection procedures, while commercial buildings and multifamily buildings with three or more units follow separate rules¹. Construction may begin only after the plans are approved and the building permit is issued and posted⁶. For a home using private septic, the municipality cannot issue the building permit until the county sanitary permit is obtained⁵. Required inspections for a new home cover footings, foundation and foundation reinforcement, rough construction, insulation and the final stage; call the inspector named on the UDC permit¹. An owner who occupies or will occupy the home may take out the construction and erosion-control permits without a Dwelling Contractor Certification, but must still meet plan, inspection and code requirements^6,11. New-home plumbing and electrical work generally still has to be done by licensed professionals⁶. Occupancy follows a final inspection with no major health or safety violations; some municipalities also issue occupancy permits⁶.

Dane County Planning & Development handles county zoning permits; a delegated municipality or Wisconsin DSPS issues the UDC building permit¹². County zoning approval generally precedes the town building permit; ask the town clerk who serves the parcel, because most towns also require their own building permit after county zoning approval and some want site-plan approval first⁷. Madison, Stoughton, McFarland and Cambridge handle their own building permits^13,14,15,16. Septic and well-location permits remain with Public Health Madison & Dane County, including inside cities and villages; call 608-242-6515 or email privatewellseptic@publichealthmdc.com⁴. Reach Dane County Zoning at (608) 266-4266 or zoning@danecounty.gov⁷. Residential county zoning permits cost $50 plus $0.10 per square foot, including porches, decks and basement areas; additional fees may apply⁷. Starting work before the permit is issued doubles the fee, and floor area for a new house is counted with basements and attached garages¹⁷. The zoning division also inspects the work against the permit¹⁸.

Dane County zoning applies only in the unincorporated towns where the town board has adopted Chapter 10 of the county code; the current ordinance lists Berry, Blue Mounds, Bristol, Springfield, Sun Prairie and Westport as opted out, and areas under city or village extraterritorial zoning are excluded^2,19. Where a town has adopted the ordinance, more restrictive county or town rules still apply³. Elsewhere in the county, cities and villages zone for themselves¹⁹. Madison, Waunakee, Stoughton, Windsor and Cambridge administer their own zoning^{14,20,21,22,23}. Public Health Madison & Dane County remains the septic-permit contact⁴. Start with the parcel's zoning-district fact sheet because permitted and conditional uses, lot standards and overlays vary by district⁷. For example, NR-C has no minimum lot size, while a newly created RE-1 lot must contain at least 15,000 square feet¹⁰. NR-C generally requires at least four feet at side and rear lot lines, although other districts and shoreland or floodplain rules may be stricter¹⁰. Building coverage is capped at 10% in NR-C and 15% in RE, while AT-B has no lot-coverage limit; height limits also vary by district and use^3,10. Development in the regulatory floodplain, including construction, grading and work on sewage or water facilities, requires a floodplain development permit²⁴. No covered building or addition may be occupied until Dane County issues its zoning certificate of compliance, subject to the ordinance's agricultural exceptions¹⁰.

Dane County requires a sanitary permit to install, repair, modify, extend, enlarge, convert, reconnect or structurally alter a private sewage system⁵. Public Health Madison & Dane County directs applicants to obtain a soil evaluation from a licensed certified soil tester and a system design from a licensed professional, who submits the application⁴. A licensed master plumber or master restricted plumber must sign the application before installation⁵. The county, not the state, runs the program day to day, though work that needs a state sanitary permit stays subject to state rules⁵. Only about 6.9% of county land is rated without severe limitations for a conventional drain field, so make soil suitability a purchase contingency⁹. A building with required plumbing must connect when the local sanitary district finds public sewer available; private sewage systems are prohibited in designated Dane County floodplain areas⁵. The county inspects private sewage and non-plumbing sanitary systems after construction but before backfilling⁵. Most septic systems also require inspection every three years⁴. A privy requires a county sanitary permit, and a structure served only by a privy cannot contain plumbing or connect to a water supply⁵.

We could not confirm a countywide rule allowing long-term RV occupancy, private-land camping or a separate tiny-home occupancy path in unincorporated Dane County. Dane County zoning applies in the towns that have adopted it, so ask Dane County Zoning, or the town if it has opted out, how the parcel's district treats the proposed vehicle or structure before buying or moving it onto the land^2,7. A manufactured home used as a new dwelling falls under the Uniform Dwelling Code permit requirement, but its land use must still fit the parcel's zoning district^1,7. We also could not confirm one countywide minimum dwelling size; ask Dane County Zoning about the chosen district and the UDC permit issuer about the proposed home's code compliance^1,7. If a tiny home is treated as a manufactured home, it counts as a single-family dwelling under county zoning, and each space in a manufactured home community must have at least 3,000 square feet³.

1. Ask Dane County Zoning to confirm permitted use, lot size, setbacks, coverage and any shoreland or floodplain overlay^7,25.
2. Ask the local sanitary district whether sewer is available; otherwise arrange the soil evaluation and sanitary permit with Public Health Madison & Dane County^4,5.
3. Obtain the county well-location permit before installing a private well or water system⁸.
4. Obtain driveway approval from the town, county or state responsible for the road; a driveway longer than 125 feet also needs a Dane County Land and Water Resources erosion-control permit⁷. Driveway permit information goes in with the zoning application, and the town clerk handles town roads⁷.
5. Submit the plans, elevations and required agency information for county zoning review before work starts^7,18.
6. After zoning approval, obtain and post the UDC permit from the delegated municipality or DSPS¹.
7. Schedule each construction-stage inspection before covering the work, then obtain the final inspection and required county zoning certificate of compliance before occupancy^6,10.

Put septic suitability first: only about 6.9% of Dane County land is rated without severe limitations for a conventional drain field⁹. Confirm sewer availability and obtain a soil evaluation before fixing the house site^4,5. Check the zoning map for the district and floodplain overlay because lot size, setbacks and coverage vary, and regulated floodplain development needs its own permit^10,25. Ask Dane County Highway Department whether county-highway frontage is controlled access: new access points need approval, and a single-family access permit costs $135^26,27. Controlled-access spacing rules can constrain driveway placement; a change in use affecting safe access also needs review²⁷. On general-access county highways, the county may issue access permits and lists a $100 single-family access fee²⁷. If the purchase depends on splitting the tract, confirm the map or plat process before closing because county rules regulate divisions creating lots of 35 acres or less²⁸. Budget separately for the UDC permit and the county zoning permit, whose residential fee starts at $50 plus $0.10 per square foot⁷.